hfss antenna design kit · overview of hfss antenna design kit •gui-based wizard tool –...
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© 2007 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
Ansoft HFSS Antenna Design Kit
Arien Sligar
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© 2007 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary
Overview of HFSS Antenna Design
Kit
• GUI-based wizard tool
– Automates geometry creation,
solution setup, and post-processing
reports for 50 common antenna
elements
– Assists in learning to use HFSS for
antenna design
• Parametric antenna geometry
– Easily modify parameters in HFSS
after generating initial model
– Facilitates parametric sweeps and
optimizations
• Synthesis feature for each antenna
– Automatically generates physical
dimensions for desired frequency
– Provides starting point for new
designs
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© 2007 ANSYS, Inc. All rights reserved. 3 ANSYS, Inc. Proprietary
Available Antenna Types
Wire DipolePlanar Dipole Rectangular Patch Elliptical Patch
Pyramidal Horn E-plane Sectoral
HornH-plane Sectoral
HornConical Horn Circular
Waveguide
Rectangular
Waveguide
Archimedean Spiral Log-Spiral Sinuous SpiralWire MonopoleElliptical Horn
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Available Antenna Types (cont)
Conical Sinuous
Spiral
Conical
Archimedean Spiral
Conical Log-
Spiral
Vivaldi (Tapered Slot) Stepped Vivaldi
Log-Periodic
Toothed
Log-Periodic
Toothed Trapezoidal
PIFA with
Shorting Strip
PIFA with
Shorting PinPIFA
Bowtie Bicone DisconeRounded BowtieLinear Taper Slot
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Available Antenna Types (cont)
Inset Fed Microstrip
Patch
Bowtie-Slot Helix – Normal and
Axial Mode
Helix -Continuous
Taper Axial ModeQFHA-SC QFHA-OC
Slot – Gap Fed Dual Slot Dipole Array
Edge Fed Microstrip
PatchInset Fed Elliptical
Microstrip Patch
Edge Fed Elliptical
Microstrip Patch
Slot – Microstrip Fed
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Available Antenna Types (cont)
WLAN Ceramic
Chip AntennaWLAN Dual Band
Slot AntennaQuasi Yagi Element Quasi Yagi 2x1
Array
UHF Probe Slot Feed Patch CPW Bowtie
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© 2007 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary
Common Applications for Each
Antenna Type
Antenna Type Common Applications
Dipole Communication systems, consumer electronics, WLAN, RFID, biomedical
Patch Consumer electronics, mobile handsets, phased arrays, GPS
Horn Reflector feeds, gain standards for antenna measurements, EMC/EMI tests,
communication systems, radar, direction finding (DF), mm-wave systems
Waveguides Phased arrays, radar, high power systems, reflector feeds, circularly polarized
systems
Planar spirals Wideband systems, multi-function apertures, electronic warfare, UWB, reflector
feeds, telemetry, direction finding, missile guidance
Conical spirals Wideband systems, circularly polarized systems, aerospace systems, EMI/EMC
testing, DF systems
Vivaldi Phased arrays, radar, wideband systems, multi-function apertures, electronic
warfare, UWB
Log-periodic Wideband systems, reflector feeds, UWB
PIFA Consumer electronics, mobile handsets, medical devices, WLAN, Bluetooth
Bowtie Phased arrays, radar, wideband systems, RFID, UWB, GPR
Bicone/discone Wideband systems, electronic warfare, EMC tests, beacons, UWB
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© 2007 ANSYS, Inc. All rights reserved. 8 ANSYS, Inc. Proprietary
Using HFSS Antenna Design Kit
• Select desired antenna type
from tree structure
• Enter necessary antenna
parameters
– Units and solution
frequency
– Physical dimensions for
element and feed
– Choice of absorbing
boundary condition (ABC)
or perfectly matched layer
(PML) for outer boundary of
HFSS model
• Alternatively, synthesize
parameters from desired
operating frequency
• Select Create Model to
invoke HFSS
Synthesis
Feature
Antenna
Parameters
Antenna
Types
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© 2007 ANSYS, Inc. All rights reserved. 9 ANSYS, Inc. Proprietary
Antenna Synthesis Option
• Creates physical characteristics from desired operating frequency or operating band
– Based on general design guidelines found in common textbooks
• It is not possible to synthesize the “best” design based on frequency alone
– Depends upon additional parameters such as size, gain, beamwidth, bandwidth, materials, etc.
– Synthesized antenna should be viewed as one possible starting point for actual design process
• Parameterized models allow for automated optimizations
Synthesis based on frequency
band for wideband antennas
Synthesis based on resonant
frequency for narrowband antennas
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© 2007 ANSYS, Inc. All rights reserved. 10 ANSYS, Inc. Proprietary
Example HFSS Model Created by
Antenna Design Kit
Ports and Boundary
Conditions
Solution Setup and
Frequency Sweep
Reports for Input
Impedance and
Radiation Patterns
Parameters for
Antenna Geometry
• Model ready
to solve
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© 2007 ANSYS, Inc. All rights reserved. 11 ANSYS, Inc. Proprietary
Import Custom Antennas
• Custom Antenna can be added to ADK user interface
• Custom library files created in directory <ADK_InstalationDirectory>\Custom_Library
– *.adk - Project File
– *.ant – Parameter File, this file contains a list of all parameters that will be shown in ADK User Interface. Lines can be removed to keep them from displaying in ADK.
– *.jpg – Design Image, image can be replace with any custom image. Maximum resolution is 250x475 pixels
• If multiple designs exists in project you will be prompted to choose which design you wish to include
• Custom library can be exported to other users by copying all files located in Custom_Library directory and pasting them into Custom_Library directory on any other machine.
•Select File Import Custom
Antenna
•Browse to location of HFSS
project to be included in ADK
•Added antenna will now be
available under Custom Antenna
in ADK Tree view
•Parameters can be entered and
model created
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© 2007 ANSYS, Inc. All rights reserved. 12 ANSYS, Inc. Proprietary
Results of Example HFSS Model
Input Impedance Return Loss
3D Radiation Pattern 2D Pattern Cuts
• Reports automatically
generated by ADK
• Antenna performance
generally evaluated
using input impedance
and far-field radiation
patterns
– Antenna must be
well-matched to
impedance of feed
circuit
– Antenna must
spatially distribute
input power in
desired direction(s)
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Design Ready for Automated
Optimization
• All antenna parameters available for Optimetrics analysis
– Parametric sweeps
– Optimizations
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Integrate Antenna Design Kit with HFSS
• Antenna Design Kit can be
added as an external tool to be
launched from within HFSS
• To add as External Tool
– Choose the menu Tools
External Tools
– Select Add to create a new
External Tool
– Specify Menu Text, Command
and Initial Directory (replace
InstallationDirectory with actual
installation directory)
• Antenna Design Kit can now be
run from the menu
– Tools Antenna Design Kit
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© 2007 ANSYS, Inc. All rights reserved. 15 ANSYS, Inc. Proprietary
Antenna Design Kit Documentation
• Complete description of parameters
necessary for each antenna
• Design references for each antenna
• HFSS results for nominal antenna
parameters
– Input impedance and far-field patterns
• Best practices for antenna design using
HFSS
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© 2007 ANSYS, Inc. All rights reserved. 16 ANSYS, Inc. Proprietary
HFSS Antenna Design Kit Summary
• Automates model creation for
variety of common antennas
– Resonant and wideband antennas
– 3D and planar antennas
– Creates ready-to-solve designs!
• Synthesis feature provides example
design for desired operating
frequency or bandwidth
• Help documentation describes all
parameters for each antenna
• Possible to include additional
antennas in future versions
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